Effect of Nb Addition on the Corrosion Behavior of Porous TiAl Based Alloys in Aqueous Environments

摘要：

　　The corrosion behavior of porous Nb-containing TiAl based alloys in HCl,NaOH and NH3?H2O aqueous solutions with various concentrations has been studied simultaneously at room temperature.The results indicate that the porous alloys have good acidic resistance which is probably based on the combined work of Ti-Ti metallic bond and covalent bond.And pitting corrosion is the main corrosion behavior of Nb-free TiAl alloys during the first 40 hours,while intergranular corrosion is the main corrosion behavior later.Nb-containing alloys have better acid corrosion resistance due to inhibiting intergranular corrosion by Nb element.In addition,the porous TiAl based alloys are much more resistant to corrosion in alkaline solutions than in acidic solutions,owing to the different oxide films formed in alkalis solutions.

关键词： TiAl based alloy Intermetallic Porous material Corrosion resistance

作者: Fan Yang Xiao Li Nan Tian Yongfeng Liang Junpin Lin

作者单位: State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China

会议类型: 国际会议

会议名称: the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))

会议地点: 太原

会议语种:英文

页码: 57-62

在线出版日期: 2012-07-13（万方平台首次上网日期，不代表论文的发表时间）